Other purifying charms like these peeled shrimp exist, but unlike those, peeled shrimp can only be used once.
昔は退魔の札とか、そんなものがあったらしいけど。それと同じさ。でも剥きえびは使うとなくなるよ。
101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin

Warding Charm is item 54 of the game's item table, in the Items group. The script names it on discs 2 and 3.
Lines of the script that name it, each with a link to its place in the script.
Other purifying charms like these peeled shrimp exist, but unlike those, peeled shrimp can only be used once.
昔は退魔の札とか、そんなものがあったらしいけど。それと同じさ。でも剥きえびは使うとなくなるよ。
The warding charm can erase that ghost's existence from our world. Use it on the ghost before the lady-in-waiting is no more! If the ghost digests her, the warding charm will erase her existence along with the ghost's! You have to hurry!
退魔の札は、物の怪そのものを消してしまう力がある。女官が、物の怪に完全に食われてしまう前に使うんだぞ!食われてしまってからだと、退魔の札の効力で、物の怪ともども女官も消滅してしまうからな。急いでくれ!
Please, I beg of you. Free me from this dark prison! I am Liang Aidan, His Majesty's loyal servant. Now... quickly... Find the warding charm and free me from this place...!
…わたくしを、わたくしを、この暗闇から救い出してください…わたくしは陛下に仕える者、梁艾丹です。退魔の札を…早く…わたくしをここから救い出してください…。
I know where the runaway ghost is! It's in the Hall of Imperial Supremacy! It ran off with Liang Aidan, His Majesty's lady-in-waiting. Here. You can use this warding charm. It's a prized family heirloom, imbued with the power of the Eight Immortals. It has great purifying capabilities.
物の怪の居場所が分かったぞ、皇極殿の中だ!女官の梁艾丹(リャン・アイダイン)が襲われたらしいんだ。これを使ってくれ、退魔の札だ。この札には八仙人の念が込められている。強い退魔の効果があるんだ。うちの家宝だ…。
Warding Charm acquired.
「退魔の札」を入手しました。
Item table: Hall Key Warding Charm Tower Key
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503